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TISP61089D

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS PROGRAMMABLE OVERVOLTAGE PROTECTORS

Power Innovations 

TISP61089

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS

PROGRAMMABLE OVERVOLTAGE PROTECTORS

NOVEMBER 1995 - REVISED FEBRUARY 1998

element must operate in under 0.1 s to prevent exceeding the TISP61089 package limit. For 2x7.7 A, the

series current limiting element must operate within 0.4 s for TISP61089 survival.

section 4.5.15 - second-level power fault testing with wiring simulator

The purpose of this test is to ensure that the telephone cable does not become a hazard due to excessive

current. A series fuse, type MDQ 1-6/10A, simulates the safe current levels of a telephone cable. If this fuse

opens the equipment fails the test. For the equipment to pass, the equipment series overcurrent element must

reduce the current to below the MDQ 1-6/10A fusing level to prevent the simulator operating. The a.c. test

voltage can range from zero to 600 V, which gives a maximum conductor current of 10 A. Table 6 shows the

simulator fusing times for three current levels.

table 6. second-level power fault currents with MDQ 1-6/10A fuse

A.C.

OPEN-CIRCUIT

DURATION RMS VOLTAGE

s

V

SHORT-

CIRCUIT

CURRENT

A

SOURCE

RESISTANCE

Ω

TOTAL

CIRCUIT

RESISTANCE

Ω

ITRMS

A

ITM

A

TIME

TO

OPEN

s

1000

100

5

20

60

1.7

2.4

∞

1000

300

15

20

60

5.0

7.1

30

1000

600

30

20

60

10

14

0.7

Using a 25 Ω series resistor will result in table 6. ITM column values of 2x3.1, 2x9.4 and 2x19. Simulator

operating times will be ∞, 12 s and 0.4 s respectively

For the equipment to pass this test, the TISP61089 series current limiting element must operate before the

MDQ 1-6/10A fusing times shown in table 7.

table 7. operating times of MDQ 1-6/10A fuse

TIME TO

OPERATE

s

0.2

0.5

1

5

10

1000

IRMS

A

17

12

9

7

6.8

2.5

overcurrent protection

To meet ‘1089, the overcurrent protection must be coordinated with the requirements of sections 4.5.7, 4.5.8,

4.5.9, 4.5.12, 4.5.13, 4.5.15 and the TISP61089. The overcurrent protection must not fail in the first level tests

of sections 4.5.7, 4.5.9 and 4.5.12. Recoverable overcurrent protectors (e.g. Positive Temperature Coefficient

Resistors) may operate during first level testing, but normal equipment working must be restored after the test

has ended. The test current levels and their duration are shown in Figure 8. First level tests have a high

source resistance and the current levels are not strongly dependent on the TISP61089 series resistor value.

PRODUCT INFORMATION

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